NO. 1935. MUSCOID FLIES FROM SOUTH AMERICA— TOWNSEND. 345 



and narrow hind margins of second and third segments and sides of 

 first segment. Legs dark brown. Wings clear, tegulse whitish. 



Type.— Cat. No. 15184, U.S.N.M. Female; TD 4019, /. r. s., 

 e., ch., m. 



Genus CNEPHALODOPSIS, new name. 



Cnephalodes Townsend, Ann. Ent. Soc. Amer., vol. 4, 1911, p. 145 [preoccupied]. 



Practically all the characters of PTiasiatacta, excepting only as fol- 

 lows : Facialia ciliate more than half way up ; facial plate plus f acialia 

 in male wider than, to about same width as, one parafacial, but para- 

 facial wider than same in female. Third antennal joint longer, one 

 and one- third to one and one-half times the elongate second joint 

 in female, nearly to fully twice or more the shorter second joint in male. 

 Mean frontal width of male equal to a little more than one- third the 

 head-width, that of female nearly one-half same. Proboscis perhaps 

 a little longer. Cheeks narrower than parafacials. 



Three to five sternopleural bristles. First and second abdominal 

 segments with 1 lateral macrochaeta- each; first with no median, 

 second with a median marginal pair, third with 8 strong marginal and 

 only short ones below, fourth with 8 to 10 strong marginal. Same in 

 both sexes. Middle longer bristle of cilia of hind tibiae pronounced, 

 especially long in female. Claws about equal in both sexes, barely as 

 long as last tarsal joint in both. 



Reproductive habit same; uterus and eggs same in general char- 

 acter, but chorion markedly different in structure, honeycomb- 

 reticulate. 



Type-species. — Cnep7ialodes{= Cnepholodopsis)poUinosus Townsend. 



CNEPHALODOPSIS POLLINOSA Townsend. 



Cnephalodes pollinosus Townsend, Ann. Ent. Soc. Amer., vol. 4, 1911, p. 145. — 

 TD 4038. 



Length of body, 10 to 12.5 mm.; of wing, 8 to 9 mm. The smaller 

 measurement is of the male. Numerous specimens of both sexes, 

 Piura, Peru, November 5, 1910, to April 21, 1911, on flowers of 

 Spilanthes, sp., and on foliage. 



Head silvery-white pollinose throughout, the vertex and facial plate 

 pale yellowish. Frontalia brownish, but thickly dusted with a silvery 

 pollen. First two antennal joints reddish-yellow, third joint and 

 arista dark brown. Palpi yellow with a faint rusty tinge. Occiput 

 with gray pile, the pollen of upper portions distinctly golden in male. 

 Entire thorax, scutellum, and abdomen of female silvery-white polli- 

 nose, but rather thinly and irregularly distributed, producing a sub- 

 marmorate appearance on abdomen. The pollen of male has a dis- 

 tinct brassy-cinereous tinge from vertex to tip of abdomen. By this 

 slight difference in shade of pollen the two sexes, so closely similar in 



